Structural, dielectric and impedance studies on high-k ZrO2–TiO2 nanocomposite
| Autor: | N. Padmamalini, K. Ambujam |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Arrhenius equation
Nanocomposite Materials science Analytical chemistry 02 engineering and technology Activation energy Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Dielectric spectroscopy symbols.namesake Nuclear magnetic resonance symbols Relaxation (physics) Dielectric loss Electrical and Electronic Engineering 0210 nano-technology High-κ dielectric |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 28:4690-4694 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-016-6109-6 |
| Popis: | High-k dielectric ZrO2–TiO2 nanocomposite was prepared using a simple Coprecipitation–calcination technique. X-ray diffraction shows that the synthesized nanocomposite showed monoclinic structure for ZrO2 and orthorhombic structure for TiO2. The SEM and TEM images show an average particle size of 20–30 nm. The dielectric properties of ZrO2–TiO2 nanoparticles were studied in the frequency range of 50 Hz–5 MHz at different temperatures. The dielectric constant and dielectric loss is found to decrease with an increase in the frequency at different temperatures. The dielectric properties of ZrO2–TiO2 nanoparticles are found to be significantly enhanced specially in the low frequency range due to confinement. The dielectric constant was found to greater than that of nano zirconia. The AC electrical conductivity measurements reveal that the conduction depends on both the frequency and the temperatures. Nyquist plots indicated the presence of a non-Debye relaxation. The determined relaxation times followed Arrhenius law and the activation energy for relaxation was found to be 0.178 eV. |
| Databáze: | OpenAIRE |
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